Initially (or at least a couple of years ago) if you submitted a PDF, the link would only be available through Scribd. It was a topic of much discussion. See

Initially (or at least a couple of years ago) if you submitted a PDF, the link would only be available through Scribd. It was a topic of much discussion. See here for example: http://news.ycombinator.com/item?id=195431 http://news.ycombinator.com/item?id=195431